The ads come at different entry and exit points for every user.

They’re not referring to the YouTube ads, but the “let’s take a minute to talk about today’s sponsor nordvpn that I used on my trip to Antarctica.” This is a part of the video file itself, and it starts and ends at the same time for all users.

Do you want them to raise the age of retirement? Because they’ll make you work till you’re a thousand before they all quit en masse.